add eax,[qword 0]
macro add [21] macro store_instruction [24]:
if (reg or rm_operand.rm) and x86.REX_REQUIRED
Processed: if (@dest.rm or @src.rm) and x86.REX_REQUIRED
Error: symbol 'rm' is undefined or out of scope.

The 67h prefix here has an effect equivalent to a choice between sign-extending (when absent) and zero-extending (when present) the 32-bit displacement value into 64-bit address. Therefore the prefix is only needed when 32-bit displacement has the sign bit set but the upper 32 bit need to be zero, like in the case of "[dword -1]" or "[dword 0FFFFFFFFh].

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